Tuesday
September 2, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry
One day at the fertilizer factory, your boss Mr. Haber comes to you with a problem. The process used by the factory to produce ammonia,the raw material for your fertilizer, is just not optimized. He would like to modify the conditions to achieve a better yield of ammonia in ...
Tuesday, February 25, 2014 at 9:24pm

Chemistry 1150
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH+4(aq)+NO...
Tuesday, February 25, 2014 at 9:14pm

Chemistry
When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...
Tuesday, February 25, 2014 at 9:03pm

Chemistry
Calculate the total heat energy needed to convert 110g of ice at -10°C to steam at 110°C..?
Tuesday, February 25, 2014 at 9:02pm

chemistry
Is deltaH standard of TdeltaS standard more important in determining whether KHT will be soluble in water at a given temperature?
Tuesday, February 25, 2014 at 8:48pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:30pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:30pm

chemistry
which of the following tetrahedral molecules is polar? please explain CH4 CF4 CH3F thanks
Tuesday, February 25, 2014 at 8:18pm

chemistry
what is the correct name for k2o
Tuesday, February 25, 2014 at 8:07pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:00pm

chemistry
how much energy is released to the environment by 50.0 grams of condensing water vapor?
Tuesday, February 25, 2014 at 7:47pm

chemistry
what is the solidification for water?
Tuesday, February 25, 2014 at 7:44pm

Chemistry
The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule of lindane contain?
Tuesday, February 25, 2014 at 6:24pm

chemistry
You take an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen) with a mass of 1.00 g, combust it under an oxygen atmosphere, and collect 2.20 g of carbon dioxide and 0.400 g water. The molar mass of aspirin is between 170 and 190 g/mol. The molecular...
Tuesday, February 25, 2014 at 6:23pm

Chemistry
Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.
Tuesday, February 25, 2014 at 5:42pm

Chemistry
How would I find the collision frequency factor with this information? Slope- -8111.4 EA- 74089.36 j/mol y-int 24.897 1/T .003
Tuesday, February 25, 2014 at 5:14pm

AP Chemistry
Which solution has the highest pH? 1. 0.1 M C6H5NH3Cl, Kb C6H5NH2 = 4.2 × 10−10 2. 0.1 M NH2(OH)2Cl, Kb NH2OH = 6.6 × 10−9 3. 0.1 M NaCl, Kb  zero 4. 0.1 M NH4Cl, Kb NH3 = 1.8 × 10−5 5. 0.1 M CH3NH3Cl, Kb CH3NH2 = 5.0 × 10−4
Tuesday, February 25, 2014 at 4:30pm

Chemistry
The element P (mass no.=39) and Q (mass no. =80) contain 20 and 45 neutrons respectively in their nucleus. Give their electron configuration separately
Tuesday, February 25, 2014 at 4:09pm

College Chemistry
The density of a 0.0122 M KMnO4 is 1.037 g/mL. Suppose 26.35 g of 0.0122 M KMnO4 are required to titrate 1.072 g of a household H2O2 solution. a)Calculate the mL of MnO4^- added to reach the endpoint. b)Calculate the moles of MnO4^- added to reach the endpoint. c)Calculate the...
Tuesday, February 25, 2014 at 3:47pm

Chemistry
Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.3252 g sample dissolved in water with 0.0284 M NaOH. A volume of 13.27 mL of the base was required to completely neutralize the ascorbic ...
Tuesday, February 25, 2014 at 2:11pm

Chemistry
Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.3252 g sample dissolved in water with 0.0284 M NaOH. A volume of 13.27 mL of the base was required to completely neutralize the ascorbic ...
Tuesday, February 25, 2014 at 1:48pm

Chemistry
3.a solution has 64 grams of HI dissolved in 250 L of water. what is its [H+] 4. What is the pH of the solution in question #3? 5. A solution has 189 grams of HNO3 dissolved in 1000 L of water. What is pH?
Tuesday, February 25, 2014 at 12:23pm

chemistry
at an equilibrium mixture of PCl5, PCl3, and Cl2 has partial pressures of 217.0 Torr, 13.2 Torr and 13.2 Torr respectively. a quantity of Cl2 is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). the system then re-equilibrates. ...
Tuesday, February 25, 2014 at 6:42am

CHEMISTRY - SCIENCE
What is the molality of a solution of 50g of I2 (iodine) dissolved in 130 mL of propane. Propane density .49g/mol.
Tuesday, February 25, 2014 at 12:12am

Chemistry
Why is a blank solution used in absorption spectroscopy? I know it is to nullify the reflection, refraction, and diffraction that occurs, but if the blank solution was a dilute solution rather deionized water, how would the concentration of Cr(VI)in a sample be affected?
Tuesday, February 25, 2014 at 12:08am

Chemistry
What atom is indicated by the following electron configuration. 1s^22s^12p^1 ?
Monday, February 24, 2014 at 11:26pm

Chemistry
How does Le Chatelier's principle explain the result you obtained when you add HCL to a suspension of Ca(OH)2 in water? Where the result was, precipitate dissappeared and an increase in temperature resulted.
Monday, February 24, 2014 at 10:51pm

chemistry
A 33.0-L cylinder contains 481 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 6.16 atm, assuming the temperature remains constant? Thanks! :D
Monday, February 24, 2014 at 10:35pm

chemistry
Suppose that a student calculated Kf of biphenyl to be 81.2C kg/mol. calculate the mass of an unknown if a solution containing 1.64 g of unknown in 18.22 g of biphenyl froze at 39.9 C
Monday, February 24, 2014 at 10:19pm

chemistry
LAST QUESTION: When solid NH4NO3 decomposes, a mixture of gases is obtained: 2 NH4NO3(s)--> 4H2O(g) + O2(g) + 2 N2(g) In an experiment, 5.02 g NH4NO3 decomposes completely in a rigid 5.00-L container. What is the total pressure in the container if the final temperature is ...
Monday, February 24, 2014 at 10:17pm

Chemistry
A neutral atom of an element has 2 electrons with n=1, 8 electrons with n=2, and 5 electrons with n=3. Write its electron configuration and find: A) atomic number B) total number of s electrons C) total number p electrons D) total number of protons E)Paired electrons F)...
Monday, February 24, 2014 at 10:00pm

Chemistry
The Maximum number of electrons that may occupy the third electron shell is A)2 B)8 C)10 D) 18
Monday, February 24, 2014 at 9:57pm

Chemistry 192
Give the electron configuration for the following: A) Ni^2+ B) Br^-
Monday, February 24, 2014 at 9:56pm

chemistry
It takes 19.6 mins for a 10.0mL sample of an unknown gas to effuse through a pinhole. A 10.0mL sample of He, required 5.05mins. What is the molar mass of the unknown gas? I got that you have to do : effuse rate of He/Effuse rate of Mx = Square root of (Mx/MHe) but then im ...
Monday, February 24, 2014 at 9:44pm

chemistry
Hydrogen peroxide, H2O2, is used to disinfect contact lenses. What volume of O2, in mL, or O2(g) at 31 degree celsius, and 741mmHg can be liberated from 10.0mL of an aqueous solution containing 3.00% H2O2 by mass? The density of aqueous solution of H2O2 is 1.01g/mL. Thanks! :)
Monday, February 24, 2014 at 9:17pm

chemistry
Carbon monoxide, CO and hydrogen, H2, react accordingly: 4CO(g)+9H2(g)-->C4H10(g)+4H2O What volume of the EXCESS REACTANT remains if 17.2L CO and 42.1L H2 are allowed to react? Assume both gases are measured at 711 degree celsius and 1.33atm.
Monday, February 24, 2014 at 9:14pm

chemistry
What is the density of CH4 gas at 32.7 degree celsius and 109kPa? The molar mass of CH4 is 16.042g/mol.
Monday, February 24, 2014 at 8:39pm

Chemistry
How would one go about separating the following substances. It's review for my test. A solution contains Al3+, Ca2+, Fe3+ , and Ni2+ ions. Draw a flow chart that outlines the procedure required to separate this mixture (use the back if you need more room)
Monday, February 24, 2014 at 8:09pm

chemistry
When you touch an object, does the electrons from your hand exchange photons with the object?
Monday, February 24, 2014 at 7:44pm

CHEMISTRY - SCIENCE
A solution is 42% NaCl by mass. If 314 mL of H2O was used to create the solution, calculate the , mass of salt that was used.
Monday, February 24, 2014 at 6:08pm

chemistry
A sheet of gold of mass 100g and a teperature of 18.0 degrees is placed flat on a sheet of iron weighing 20g and at a temperature of 55.6 degrees. what is the final temperature of the combined metal.
Monday, February 24, 2014 at 6:04pm

Chemistry
If a 0.192 g sample of copper metal reacts with elemental sulfur to form 0.240 g of the sulfide product, (a) find the percent by mass of copper and sulfur in the product and (b) find the empirical formula of the copper sulfide
Monday, February 24, 2014 at 4:32pm

Chemistry
When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?
Monday, February 24, 2014 at 3:26pm

Chemistry
In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery. Fe(s) + 2 NiO(OH)(s) + 2 H2O(l) Fe(OH)2(s) + 2 Ni(OH)2(aq) How many mole of Fe(OH)2, is produced when 3.70 mol Fe and 6.95 mol NiO(OH) react?
Monday, February 24, 2014 at 3:26pm

Chemistry
A volume of 80.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 21.7mL of 1.50 M H2SO4 was needed? The equation is 2KOH(aq)+H2SO4(aq)→K2SO4(aq)+2H2O(​l)
Monday, February 24, 2014 at 2:28pm

Chemistry
An electron traveling at 3.1 x 10^5 m/s has an uncertainty in it's velocity of 1.07 x 10^5 m/s. What is the uncertainty in it's position?
Monday, February 24, 2014 at 2:09pm

Chemistry
name the ions: Ag+ and P-3... and it's not silver..
Monday, February 24, 2014 at 1:51pm

Chemistry
Are cold alkalis the same as bases? If not, then what is the difference? Can you also give some examples if they are not the same? Thanks!
Monday, February 24, 2014 at 1:27pm

Chemistry
If 3.943 g of anhydrous salt remains after heating 5.00 g of CuCℓ2·xH2O, determine the number of molecules of water of hydration in the original hydrate.
Monday, February 24, 2014 at 6:16am

chemistry
using the ideal gas law or the combined gas law,why does the air pressure inside the tires on my motorcycle increases during the time I am riding it. Consider what factors are being kept constant and what are changing and how. What if I weigh alot?
Monday, February 24, 2014 at 12:26am

Chemistry
Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.640. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I need to know what equations to use to find the answer not just how to get it
Sunday, February 23, 2014 at 11:55pm

Chemistry
In an emission spectroscopy, when trying to identify the most intense emission line for an ion, does one have to identify it using the wavelength and the intensity?
Sunday, February 23, 2014 at 10:55pm

chemistry
An aqueous solution is analyzed and found to contain potassium ions and sulfite ions. Write the equation for the dissolution of the salt that produced this solution. If the solution contains 0.600 mol of potassium ions, how many moles of sulfite ions are present? ...
Sunday, February 23, 2014 at 10:43pm

chemistry
Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the overall ionic equation, and the net ionic equa- tion for this reaction. If 10.27 g of copper(II) chloride react, what is the maximum amount of ...
Sunday, February 23, 2014 at 10:43pm

chemistry
In the net ionic equation for the neutraliza- tion reaction between hydrofluoric acid (HF) and sodium hydroxide (NaOH), the HF is rep- resented as 1. the molecule, HF. 2. neither the molecule nor the separated ions since it is a spectator in the reaction. 3. the ...
Sunday, February 23, 2014 at 10:41pm

Chemistry
Which of the following substances would be expected to be the strongest electrolyte (best conductor of electricity) in solution with H2O as the solvent? 1. HF 2. BaF2 3. PCl3 4. CH3OH
Sunday, February 23, 2014 at 10:37pm

Chemistry
If 16.0 mL of 8.5 ✕ 10-2 M HClO4 is added to 22.0 mL of 7.6 ✕ 10-4 M KOH, what is the pH of the solution?
Sunday, February 23, 2014 at 10:29pm

Chemistry
A 0.670 g sample of impure Al2(SO4)3 reacts with excess BaCl2. If the sample produces 0.760 g of BaSO4, what is the mass percent of Al2(SO4)3 in the sample?
Sunday, February 23, 2014 at 10:28pm

chemistry
My motorcycle has a capacity of 4.5 gal of gasoline. If I combust all of the octane to power my motorcycle, what is the volume of CO2 generated from just my motorcycle on one tank of gas?Assume that I burn all of the gasoline into CO2 on warm day in June, where it is 85 ...
Sunday, February 23, 2014 at 10:22pm

Chemistry
A gaseous hydrogen and carbon containing compound is decomposed and found to contain 85.63% C and 14.37% H by mass. The mass of 258 mL of the gas, measured at STP, was found to be 0.646 g.What is the molecular formula of the compound?
Sunday, February 23, 2014 at 10:00pm

Chemistry
The activation energy of a certain reaction is 34.9kJ/mol . At 23 ∘C , the rate constant is 0.0190s−1. At what temperature in degrees Celsius would this reaction go twice as fast?
Sunday, February 23, 2014 at 9:30pm

Chemistry
A gas at 54◦C occupies 4.54 L. At what tem- perature will the volume be 3.04 L, assuming the same pressure?
Sunday, February 23, 2014 at 9:18pm

Chemistry
The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the right-hand lead ...
Sunday, February 23, 2014 at 8:56pm

chemistry
My teacher went over it really fast and now I'm just really confused about how to do my homework =( Calculate the cell potential for the following reaction as written at 25C, given that [Cr2+] = 0.821 M and [Ni2+] = 0.0190 M. Cr(s) + Ni2+ (aq) <==>Cr2+ (aq) + Ni(s) ...
Sunday, February 23, 2014 at 8:55pm

Chemistry
Given these standard reduction potentials at 25 C 1. Cr3+ + e- ===> Cr2+ E1=-0.407 V 2. Cr2+ + 2e- ===> Cr(s) E2=-0.913 V determine the standard reduction potential at 25C for the half-reaction equation Cr3+ + 3e- ===> Cr(s) E=? When I tried, I got 1.08V and I honesty...
Sunday, February 23, 2014 at 8:53pm

Chemistry
how do I calculate theoretical yield?
Sunday, February 23, 2014 at 8:14pm

Chemistry
The half-life for the first-order conversion of A to B is 56.5 hours. How long does it take for the concentration of A to decrease to 10.0% of its original amount? Our professor has given us the answer - 188hr but I am not entirely sure how he got it.
Sunday, February 23, 2014 at 8:11pm

chemistry
A 500. mL sample of hydrogen gas is collected over water at 27 °C. The pressure of the hydrogen and water vapor mixture is 78.5 kPa and the vapor pressure of water at 27 °C is 3.6 kPa. What is the partial pressure of the dry hydrogen gas?
Sunday, February 23, 2014 at 7:39pm

Chemistry
If you use the lmax during the calibration plot (Beer's plot) and then change to some other wavelength for the measurement of the sample, how will this affect x? x is the moles of H20 in the equation
Sunday, February 23, 2014 at 7:17pm

College Chemistry
If your heating generates soot on the bottom of the crucible, what is the origin of the soot? How will this soot collection affect x? x is the mols of waters of hydration
Sunday, February 23, 2014 at 7:16pm

Chemistry--acids
Which of the following substances can act as a Bronsted acid in aqueous solution? (Select all that apply.) NH41+ H2 O2 C4H10 H2CO3 H2SO4 H3O1+
Sunday, February 23, 2014 at 7:14pm

chemistry
If 16.0 mL of 8.5 ✕ 10-2 M HClO4 is added to 22.0 mL of 7.6 ✕ 10-4 M KOH, what is the pH of the solution?
Sunday, February 23, 2014 at 7:11pm

chemistry
If 1.87 g of acetic acid(CH3CO2H) reacts with 2.31 g of isopentyl alcohol(C5H12O) to give 2.96 g of isopentyl acetate(C7H14O2), what is the percent yield of the reaction?
Sunday, February 23, 2014 at 7:03pm

Chemistry
How many grams of AL(NO3)3 are produced when 23.5 grams of Aluminum react with 133 mL of 6.5M HCL?
Sunday, February 23, 2014 at 7:03pm

Chemistry
If your heating generates soot on the bottom of the crucible, what is the origin of the soot? How will this soot collection affect x?
Sunday, February 23, 2014 at 7:00pm

Chemistry
If you use the lmax during the calibration plot (Beer's plot) and then change to some other wavelength for the measurement of the sample, how will this affect x?
Sunday, February 23, 2014 at 7:00pm

chemistry
A sample of helium gas has a volume of 328 mL at 0.69 atm. What pressure is needed to reduce the volume at constant temperature to 32 mL?
Sunday, February 23, 2014 at 6:33pm

Chemistry
Ik this has been answered, but doesn't the copper oxide have something to do with it? And could you explain it in simpler terms? I'm just confused because you said forget the copper oxide, but your using it somehow, what puzzles me is the carbon dioxide, because the ...
Sunday, February 23, 2014 at 6:14pm

Chemistry
aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. how many grams of aluminum sulfate would be formed if 250 g H2SO4 completly reacted with aluminum
Sunday, February 23, 2014 at 5:10pm

Chemistry
How do I calculate moles from the given litres and mass of the substance (in grams)?
Sunday, February 23, 2014 at 3:35pm

Chemistry
How do I calculate moles from the given litres and mass of the substance (in grams)?
Sunday, February 23, 2014 at 3:24pm

college chemistry
A certain metal crystallizes in a face-centered cubic arrangement and has a density of a density and atomic radius of 12.41 g/cm3 and 134.5 pm, respectively. Which element below is it?
Sunday, February 23, 2014 at 2:43pm

chemistry
CaO has a face-centered cubic unit cell in which the O2- anions occupy corners and face centers, while the cations fit into the hole between adjacent anions. What is its density if the ionic radii of Ca2+, O2- ions are 57.63 pm and 184.0 pm, respectively?
Sunday, February 23, 2014 at 12:30pm

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Sunday, February 23, 2014 at 12:11pm

Chemistry - check answers
Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when ...
Sunday, February 23, 2014 at 10:53am

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Sunday, February 23, 2014 at 8:25am

chemistry
In which of the following triatomic molecules or ions are both of the bonds multiple bonds? HCN CO2 NO2 more than one correct response no correct response If more than one correct response then please show all the correct answers. thanks
Sunday, February 23, 2014 at 5:36am

chemistry
the number of nonbonding electrons exceeds the number of bonding electrons in the Lewis structure of which of the following molecules? HCN NH3 H2O more than one correct response no correct response if more than one correct response please show all correct responses. thanks
Sunday, February 23, 2014 at 5:34am

chemistry
Sixteen electrons are present in the Lewis structure of which of the following molecules? CO2 N2O SO2 more than one correct response no correct response If more than one correct response please show all correct answers thank
Sunday, February 23, 2014 at 5:31am

chemistry
in which of the following pairs of compounds are both members of the pair molecular compounds? PCl3 and LiBr CCl4 and KOH NaH and CaF2 more than one correct response no correct response if more than one response please show all the correct answers thanks
Sunday, February 23, 2014 at 5:29am

chemistry
Which of the following statements concerning differences between ionic and molecular compounds is correct? Molecular compounds contains two elements, and ionic compounds contain three of more elements ionic compounds contain oxygen, and molecular compounds do not. molecular ...
Sunday, February 23, 2014 at 5:27am

chemistry
the correct name for the compound H2Te is hydrogen telluride dihydrogen telluride dihydrogen monotelluide hydrogen monotelluride please explain why. I am having a very hard time comprehending this stuff. Thanks
Sunday, February 23, 2014 at 5:24am

chemistry
Which of the following is a molecular compound that contains five atoms per molecule? germanium tetrabromide dinitrogen monoxide dinitrogen pentoxide nitrogen diselenide please explain. I am having a very hard time comprehending this stuff thanks
Sunday, February 23, 2014 at 5:22am

chemistry
which of the following linear molecules is a nonpolar molecule containing polar bonds? H-C=N between C and N are three lines O=C=O H-Cl N=N between N and N are three lines Please explain... I am having a hard time comprephening this stuff. Thanks
Sunday, February 23, 2014 at 5:20am

chemistry
which of the following diatomic molecules contains the bond of greatest polarity? N2 Cl2 ClI BrF please explain why having a real hard time comprehending this stuff thanks
Sunday, February 23, 2014 at 5:17am

chemistry
given the following electronegativities Na=0.9, H=2.1, Cl=3.0 which of the following statements is true? H2,Cl2, and HCl are polar covalent molecules NaCl is a polar covalent compound and HCl is an ionic compound HCl is a nonpolar covalent compound and Cl2 is a polar covalent ...
Sunday, February 23, 2014 at 5:15am

chemistry
Electronegativity is a concept that is useful along with other concepts in predicting the polarity of a bond deciding how many electrons are involved in a bond formulating a statement of the octet rule determining the charge on a polyatomic ion
Sunday, February 23, 2014 at 5:08am

Chemistry
which of the following sets of elements is arranged in order of decresing electronegativity? O,S,As Cl, B, CL Br, Cl, P Be, C, O please explain correct answer
Sunday, February 23, 2014 at 5:05am

chemistry
what is the geometry of the molecular compound formed by the reaction of sulfur with hydrogen? linear angular trigonal planar tetrahedral please explain the correct answer
Sunday, February 23, 2014 at 5:03am

chemistry
VSEPR theory predicts that the geometry of AsH3 molecule is which of the following. linear trigonal planar trigonal pyramidal tetrahedral please explain the correct answer
Sunday, February 23, 2014 at 5:01am

Pages: <<Prev | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members